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+// // Chat Homework
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+
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+// function jsonPost(url, data) {
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+// return new Promise((resolve, reject) => {
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+// var x = new XMLHttpRequest();
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+// x.onerror = () => reject(new Error('jsonPost failed'))
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+// //x.setRequestHeader('Content-Type', 'application/json')
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+// x.open("POST", url, true);
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+// x.send(JSON.stringify(data))
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+
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+// x.onreadystatechange = () => {
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+// if (x.readyState == XMLHttpRequest.DONE && x.status == 200) {
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+// resolve(JSON.parse(x.responseText))
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+// }
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+// else if (x.status != 200){
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+// reject(new Error('status is not 200'))
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+// }
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+// }
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+// })
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+// }
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+
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+// // Stage 0
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+
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+// jsonPost("http://students.a-level.com.ua:10012", {func: 'addMessage', nick: 'Anon', message: 'Я не умею копипастить в консоль, зато умею жать красную кнопку.'})
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+
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+// Stage 1-4
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+
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+let btn = document.querySelector('#buttonBox')
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+btn.innerText = 'Send'
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+let nick = document.querySelector('#nicknameBox')
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+let msg = document.querySelector('#messageBox')
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+
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+btn.onclick = function sendMessage() {
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+ let nick = document.querySelector('#nicknameBox').value
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+ let msg = document.querySelector('#messageBox').value
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+ jsonPost("http://students.a-level.com.ua:10012", {func: 'addMessage', nick: nick, message: msg})
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+ document.querySelector('#nicknameBox').value = ''
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+ document.querySelector('#messageBox').value = ''
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+}
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+
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+function addMessage() {
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+ setInterval(function() {
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+ jsonPost("http://students.a-level.com.ua:10012", {func: 'getMessages', messageId: 0})
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+ .then (post => {console.log(post.data)
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+ for(messageId in post.data) {
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+ let chat = document.querySelector('#chatBox')
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+ let div = document.createElement('div')
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+ let p = document.createElement('p')
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+ p.innerHTML = post.data[messageId].nick + ':' + ' ' + post.data[messageId].message
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+ let t = document.createElement('time')
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+ t.innerHTML = `${new Date(post.data[messageId].timestamp).toLocaleString()}`
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+ chat.prepend(div)
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+ div.append(p)
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+ div.append(t)
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+ }
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+ messageId = post.nextMessageId})
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+ },3000)
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+}
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+addMessage()
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+
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+// Stage 5
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+
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+async function sendMessage(nick, msg) {
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+ jsonPost('http://students.a-level.com.ua:10012', {func: 'addMessage', nick: nick, message: msg})
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+ document.querySelector('#nicknameBox').value = ''
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+ document.querySelector('#messageBox').value = ''
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+}
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+
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+async function getMessages() {
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+ jsonPost("http://students.a-level.com.ua:10012", {func: 'getMessages', messageId: 0})
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+ .then (post => {console.log(post.data)
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+ for(messageId in post.data) {
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+ let chat = document.querySelector('#chatBox')
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+ let div = document.createElement('div')
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+ let p = document.createElement('p')
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+ p.innerHTML = post.data[messageId].nick + ':' + ' ' + post.data[messageId].message
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+ let t = document.createElement('time')
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+ t.innerHTML = `${new Date(post.data[messageId].timestamp).toLocaleString()}`
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+ chat.prepend(div)
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+ div.append(p)
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+ div.append(t)
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+ }
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+ })
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+}
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+
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+async function sendAndCheck() {
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+ await sendMessage(nick.value, msg.value)
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+ await getMessages()
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+}
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+
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+btn.onclick = () => sendAndCheck()
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+
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+async function checkLoop() {
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+ getMessages()
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+}
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+
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+checkLoop()
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+
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+// Stage 6
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+
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+async function jsonPost(url, data) {
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+ let response = await fetch(url, {method: 'POST', body: JSON.stringify(data)})
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+ return await response.json()
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+}
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+
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+let delay = ms => new Promise(ok => {setTimeout(() => ok(ms), ms)})
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Евгения Акиншина